Merge pull request #2146 from briandowns/add_hook_for_rke2

pkg/cli/cmds/server.go

 package cmds
 
 import (
+	"context"
+
+	"github.com/rancher/k3s/pkg/daemons/config"
 	"github.com/rancher/k3s/pkg/version"
 	"github.com/rancher/spur/cli"
 	"github.com/rancher/spur/cli/altsrc"
@@ -54,6 +57,7 @@ type Server struct {
 	ClusterInit              bool
 	ClusterReset             bool
 	EncryptSecrets           bool
+	StartupHooks             []func(context.Context, config.Control) error
 }
 
 var ServerConfig Server

pkg/cli/server/server.go

@@ -193,6 +193,8 @@ func run(app *cli.Context, cfg *cmds.Server) error {
 		return errors.Wrap(err, "Invalid tls-min-version")
 	}
 
+	serverConfig.StartupHooks = append(serverConfig.StartupHooks, cfg.StartupHooks...)
+
 	// TLS config based on mozilla ssl-config generator
 	// https://ssl-config.mozilla.org/#server=golang&version=1.13.6&config=intermediate&guideline=5.4
 	// Need to disable the TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256 Cipher for TLS1.2

pkg/server/server.go

@@ -60,6 +60,12 @@ func StartServer(ctx context.Context, config *Config) error {
 		return errors.Wrap(err, "starting tls server")
 	}
 
+	for _, hook := range config.StartupHooks {
+		if err := hook(ctx, config.ControlConfig); err != nil {
+			return errors.Wrap(err, "startup hook")
+		}
+	}
+
 	ip := net2.ParseIP(config.ControlConfig.BindAddress)
 	if ip == nil {
 		hostIP, err := net.ChooseHostInterface()

pkg/server/types.go

 package server
 
 import (
+	"context"
+
 	"github.com/rancher/k3s/pkg/daemons/config"
 )
 
@@ -10,4 +12,5 @@ type Config struct {
 	ControlConfig    config.Control
 	Rootless         bool
 	SupervisorPort   int
+	StartupHooks     []func(context.Context, config.Control) error
 }